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I suppose then that the philospher, & many a genecist who stand by the sayin' "What does not kill me, makes me stronger"...are all wrong...Cull away...cull away...

Quote: Wild birds that get sick are eaten by critters. The ones who don't get sick live to breed on. Nature has its own "hatchet". Yer playin' absolutes...not all wild birds that get sick, are going to be eaten by wild animals...& the ones that don't get sick are the ones that aren't...

Funny, what would happen to the birds that are exposed to the pathogens that domestic fowl are exposed to? There's no hatchet in the wild, 'cept maybe some wild animals that would get to eat carion, & more nutrients into the soil...should a flock of wild red jungle fowl get exposed, & one or...

I'm on record as sayin' that breeding for resistance is allowing the sick bird to recover & produce progeny as this pesticide resistance model in bugs shows clearly: http://en.wikipedia.org/wiki/Pesticide_resistance

Quote: Well said Chris.

What Would Mendel Do?

Quote: Gee, I think I realize that...that's why I suggested, just like a good scientist would do, would be to quartine the sick birds...plus, keep their progeny away from the healthy flock, to see if the pathogen was passed on or not...once you realize that the pathogen HASN'T been passed onto...

Well, obviously something would've changed in that bird that survives, produces offspring that will survive...it could be a genetic mutation within microscopic regcognition of helper T cells (or Killer T cells, I can't quite remember) in recognizing that said pathogen that has invaded the body...

Quote: So then, how did the ones that didn't get sick from exposure, get that way? From parents that survived the preivous sickness, & passed on it's surviable genese, the ones that died, can't! Again, if you cull the ones that ARE sick, & you don't give them a chance to recover, yer just...

Quote: WHo has suggested culling birds that aren't sick? Lemme reclarify for you then, please: "Immediate culling (of SICK birds) from the flock, of those that aren't sick, is just artificial selection." Dunno why you'd imply that I am implyin' that you can cull NON sick birds...(shakes...

Quote: No, you're missing an important point. When they get sick they're not allowed to "recover or die", they're culled. Even if they were to recover they'd still be genetically predisposed to the particular disease. Obviously other birds in the flock would also have been exposed to the...

"So, that isn't really breeding for resistance then, is it?" Nope...

"Worms will eventually get resistant to every worm medication on the market. I don't know what will happen then," Do it the old fasioned way, breed them for resistance...

Quote: Resistance does mean the bird gets sick, doesn't die from the sickness, & pass on the genes that they carry, that made them survive in the first place... If your fowl gets sick from Mareks, Laryngo or Coryza and survive they will most likely be carriers of the disease. Hence the...

Kathy, keep in mind, I didn't know that a bird, once recovered, could contaminate again, with original sickness, that that bird recovered from, if that's the case, then you'll hafta keep that bird & any subsequent birds, that do get sick, & recover, quaranteened from the rest of yer flock. If...

Quote: Resistance does mean the bird gets sick, doesn't die from the sickness, & pass on the genes that they carry, that made them survive in the first place...

Breeding for resistence is exactly that. Exposing them to disease, via no vaccinations, & then gettin' sick, & allowing them to recover or die, & then breed that specific bird to produce offspring with a greater chance to defeat what ever infected the bird. Overtime, bred enough, you'll get a...